c++ problems and solutions related to oops

1->How to publicly inherit from a base class but make some of public methods from the base class private in the derived class?

ans-

1) You can use public inheritance and then make bar private:

class Base {
public:
    void foo(){}
    void bar(){}
};

class Derived : public Base {
private:
    using Base::bar;
};

2) You can use private inheritance and then make foo public:

class Base {
public:
    void foo(){}
    void bar(){}
};

class Derived : private Base {
public:
    using Base::foo;
};

Note: If you have a pointer or reference of type Base which contains an object of type Derived then the user will still be able to call the member.